Overclocking i5 2500K

Rusty0611

Rusty0611

Rusty0611

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I'm in the process of overclocking my CPU and appear to be stable at 4.5 GHZ which seems (from my googling) to be a pretty standard overclock for these chips. I'm happy with 4.5 GHZ so not too interested in going any further.

I have an ASUS P8Z68-V LX so I can't set the voltage manually and can only change it through offset. I don't pretend to fully understand offset voltage but I do get the rough idea of it!

My temperatures are ~58-60C while at full load for around 60 minutes in prime95 and idle temperatures are anything between 23-25C (Speedstep and a cold room!)

With my voltages on auto my vcore fluctuates between 1.344V and 1.360V at full load. Is this acceptable? I think I can probably get it lower but I'm really struggling with the bios settings. I have changed the offset to negative and tried to reduce it this way but then the idle voltage (I assume) becomes too low when the speed steps down and I get BSOD... Is the only real way to get a stable lower voltage to disable it and then use negative offset?

Any help/opinions would be hugely appreciated.
 
Another thing I forgot to mention is that although I get those vcores in prime95; when I'm playing games (e.g. SWTOR) I notice my vcore can spike up to 1.424V but fluctuates between 1.4V and that

I don't mind 1.36V but I don't like the look of 1.424V that much! What is causing this and is there any way to negate it? This probably ties into my first post about lowering the voltages anyway. The spike of vcore while in games has really confused me...

I read something about disabling LLC but this hasn't changed anything.
 
Hi Rusty, you have exactly the same mobo as me. I've had lockups (in Windows, requiring hard reset) at 4.5gig so have settled on a still-pretty-good 4gig. I think there's an option for 'VCC voltage'- I think that's the same thing, but please ask someone else first.
Think a bit more vcore is what I need- at 4.2 it's reading 1.26, seems a tad low to me.
Jon
 
Hi Jon, do you use offset CPU voltage? The setting is really difficult to work out and I kind of wish I went for the pro board now to enable manual setting of voltages.

I was just randomly changing settings last night and I got it to boot relatively stable with voltage offset at -0.015V and 4.5GHz. I say relatively stable because worker two threw an error after about 40 minutes about rounding I believe... so this is by no means completely stable.

I had a look around and it appears this can be caused by DRAM voltage?? I have mine set to XMP profile with voltage set manually then to 1.5V. Is it worth upping it to say 1.58V and try testing for stability from that point? Or is the error due to too much negative voltage offset? My RAM is rated at 9-9-9-27 1.65V so I'm not sure if setting it to 1.5V is causing an issue

Does anyone know? Or is it just a case of trial and error?
 
Yes, just leave it at 1.5V. Not really much point in tinkering with the ram- you just risk more instability for very little gain. Run it at stock speed!
I didn't use the voltage offset thingywhatsit, but I did enable PLL overvoltage (or something like that), and I'm now stable at 4.5gig so that's worked...
 
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